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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 514 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0641 or P0651 (ECM) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

The engine control module (ECM) has 2 internal 5-volt reference circuits. Each internal reference circuit provides external 5-volt reference circuits to more than one sensor. A short to ground or short to voltage on one external 5-volt reference circuit can affect all the components connected to the same internal 5 V reference circuit.

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